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/*-
* Copyright (c) 2009 David Schultz <das@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "namespace.h"
#include <sys/param.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "un-namespace.h"
#include "libc_private.h"
#include "local.h"
static inline size_t
p2roundup(size_t n)
{
if (!powerof2(n)) {
n--;
n |= n >> 1;
n |= n >> 2;
n |= n >> 4;
n |= n >> 8;
n |= n >> 16;
#if SIZE_T_MAX > 0xffffffffU
n |= n >> 32;
#endif
n++;
}
return (n);
}
/*
* Expand *linep to hold len bytes (up to SSIZE_MAX + 1).
*/
static inline int
expandtofit(char ** __restrict linep, size_t len, size_t * __restrict capp)
{
char *newline;
size_t newcap;
if (len > (size_t)SSIZE_MAX + 1) {
errno = EOVERFLOW;
return (-1);
}
if (len > *capp) {
if (len == (size_t)SSIZE_MAX + 1) /* avoid overflow */
newcap = (size_t)SSIZE_MAX + 1;
else
newcap = p2roundup(len);
newline = realloc(*linep, newcap);
if (newline == NULL)
return (-1);
*capp = newcap;
*linep = newline;
}
return (0);
}
/*
* Append the src buffer to the *dstp buffer. The buffers are of
* length srclen and *dstlenp, respectively, and dst has space for
* *dstlenp bytes. After the call, *dstlenp and *dstcapp are updated
* appropriately, and *dstp is reallocated if needed. Returns 0 on
* success, -1 on allocation failure.
*/
static int
sappend(char ** __restrict dstp, size_t * __restrict dstlenp,
size_t * __restrict dstcapp, char * __restrict src, size_t srclen)
{
/* ensure room for srclen + dstlen + terminating NUL */
if (expandtofit(dstp, srclen + *dstlenp + 1, dstcapp))
return (-1);
memcpy(*dstp + *dstlenp, src, srclen);
*dstlenp += srclen;
return (0);
}
ssize_t
getdelim(char ** __restrict linep, size_t * __restrict linecapp, int delim,
FILE * __restrict fp)
{
u_char *endp;
size_t linelen;
FLOCKFILE(fp);
ORIENT(fp, -1);
if (linep == NULL || linecapp == NULL) {
errno = EINVAL;
goto error;
}
if (*linep == NULL)
*linecapp = 0;
if (fp->_r <= 0 && __srefill(fp)) {
/* If fp is at EOF already, we just need space for the NUL. */
if (__sferror(fp) || expandtofit(linep, 1, linecapp))
goto error;
FUNLOCKFILE(fp);
(*linep)[0] = '\0';
return (-1);
}
linelen = 0;
while ((endp = memchr(fp->_p, delim, fp->_r)) == NULL) {
if (sappend(linep, &linelen, linecapp, fp->_p, fp->_r))
goto error;
if (__srefill(fp)) {
if (__sferror(fp))
goto error;
goto done; /* hit EOF */
}
}
endp++; /* snarf the delimiter, too */
if (sappend(linep, &linelen, linecapp, fp->_p, endp - fp->_p))
goto error;
fp->_r -= endp - fp->_p;
fp->_p = endp;
done:
/* Invariant: *linep has space for at least linelen+1 bytes. */
(*linep)[linelen] = '\0';
FUNLOCKFILE(fp);
return (linelen);
error:
fp->_flags |= __SERR;
FUNLOCKFILE(fp);
return (-1);
}
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